Form for concrete conduit constructions.



C. D. IVICARTHUR.

FORM FOR CoNcREE CONDU IT CONSTRUCTIONS.

APPLICATION FILED FEB. I2. 1911.

.Patented Jan. I4, 11319.

Si. ATENT OFFICE.

CHARLES D. MCARTHUR, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAW STEEL CONSTRUCTION COMPANY, A CORPORATION 0F NEW JERSEY.

FORM FOR CONCRETE CONDUIT CONSTRUCTIONS.

Specification of Iletters Patent.

iatenfea Jan. 14, 1919.

Application led February 12, 1917. Serial No. 147,983.

To all whom 'it may concern:

Be it known that I, CHARLES D. Mc- ARTHUR, siding at Pittsburgh. in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Forms for Concrete Conduit Constructions, of which the following is a specification.

The invention relates to forms for use in making concrete pipe or conduits, and has for its principal objects; the provision of a construction whereby metal water sto s7 can be conveniently inserted atintervalst rou hout the length of the pipe; and the. provis1on of a construction in Which thewater stop members can be inserted as the pipe is continuously formed, instead of requiring that the sections of pipe be formed alternately using bulkheads as has heretofore been the practice. One embodiment of the invention is illustrated in the accompanying drawings, wherein- Figure 1 is a cross-section through a completed conduit with a part of the apparatus in elevation, the section` being taken on the line I-I of Fig. 2; Fig. 2 is alongitudinal section through the form before the concrete is applied; and Fig. 3 is a longitudinal section through a section of the completed conduit, the form being removed.

As indicated in Fig. 2 the form or mold comprises an outer form, two of whose sections l and 2 are shown, and an inner form, two of whose sections'3 and 4 are shown.

The sections 3 are each made in two partsv 4, but their upright flanges are spaced apart to receive the series of plates 7 shown in Fivs. 1 and 2.

-s indicated in Fig. 1, the plates 7 together with the plates 8, which are of .slightly different form, constitute an annular. ring, which ring serves as a support a citizen of the United States, re-V ing operation to for the water stop member 9, such member being preferably of copper and provided with the crimp 10. The plates 7 and 8 are clamped between the flanges of the angles 6, such flanges being secured by means of bolts (not shown), which pass through the holes l1 inthe plates 7 and 8 (Fig. 1).

In operation the parts are assembled as indicated in Fig. 2, and the space between the outerA and inner forms is filled with concrete, such concrete being supplied through the outer form, the upper sections of which are removed to provide the necessary admission space. v After the necessary amount of concrete has been filled in, the top plates are put in and the concrete allowed to set. After the concrete has set, the outer and inner forms are removed by disassembling them, the bolts through the flanges of the angles 6' being removed to release the plates 7 and to disconnect the sections 3 and 4. The plates 7 and 8 are then removed, the plates 8 being firstremoved. This removal is facilitated by reason of the cut out portion 12 (Fig. l), such cut out portion being fitted with a plate or board during the fillprevent the escape of concrete at such time.

When the parts are thus disassembled the .copper water stop 9 is left embedded in the pipe as indicated in Fig. 3, the slot formed by the removal of the plates 7 and 8 being filled with the grout 13. In order to prevent the grout from filling the crimp 10 in the Water stop, such crimp can be first filled by means of rope or other similar material, By the use of the ap arat'us as above set forth the conduit or pipe can be easily and conveniently constructed with the water stops at any desired intervals, the operation, in so far as the handling of the inner and outer form sections is concerned, being substantially the same as if no water stops were employed, which operation is much simpler and easier than where the conduit is made in alternate sectionslwith the use of bulkheads at the end of each section to facilitate the positioning of the Water stops. In case the conduit cracks due to expansion or contraction, the rupture will occur oppositcthe crimp of the water stop asV thisis the thnnest and weakest point inthe conduit, and no damage will lresult since the water stop will prevent leakage at this point. Other advantages incident to the use ot the apparatus will readilY be apparent to those skilled in the art.

What I claim is:

l. In combination in a conduit orm,`an outer form, an inner sectional torni, and reme 'able means carried at thefjoints ot' the inner form and adapted to support a metal water stop member lying between the two forms. l

2. In combination in a conduit form, an outer torni, an inner sectional form comprising two abutting sections, and a member held between the said abutting sections and adapted to support a water stop member lying between the two forms opposite the said abutting ends.

3. In combination in a conduit form, an onteiform, an inner sectional formy comprising two alined sect-ions with their opposingends spaced apart, a series ot' supporting pla-tes lying between the said opposing ends of the inner sections and adapted to support a water stop member lying' between the two forms, and means for securing' the said oposing endsot the inner sections together with the supportingplates held therebetween.

4.In combination in a conduit form, an

4outer torni, aninner sectional 'form comouter and inner able supporting means carried at the joints prising two alined sections with their .opposing ends spaced apart, a series of supporting plates lying posing ends of the inner adapted to support a water stop member lying between the two forms, and means for securing the said opposing ends of the inner sections together with the supporting plates held therebetween, the said supporting plates forming a continuous ring but formed so as to be removable one after the other after the means foi-.securing the inner sec tions together are removed.

In eombination in a conduit form, sectional forms, and remow sections and of one of said `forms and adapted to support water stop members.

6. In combination in a conduit form, outer and inner sectional forms, and removable plates releasablycarried between the opposing ends of the sections ot one ot' the forms and adapted to members.

T. In combination in a conduit form, outer and inner sectional forms, and removable sectional rings clamped between the opposing' ends ot' the sections of one of the forms and adapted to engage and support water stop members lying between the joints.

CHARLES D. MCARTHUR.

between the said op support water stop 

